Why did the sugar cane farmers bring cane toads to Australia？A．To enrich the variety of sp

Why did the sugar cane farmers bring cane toads to Australia？

A．To enrich the variety of species.

B．To deal with cane beetles.

C．To balance the>eco-system.

D．To strengthen the food chain.

请帮忙给出正确答案和分析，谢谢！